US2220294A

US2220294A - Float valve mechanism

Info

Publication number: US2220294A
Application number: US220567A
Authority: US
Inventors: Sibley Paul
Original assignee: WORCESTER TAPER PIN Co
Current assignee: WORCESTER TAPER PIN Co
Priority date: 1938-07-21
Filing date: 1938-07-21
Publication date: 1940-11-05
Anticipated expiration: 1957-11-05

Description

Nov. 5, 1940. P. slBLEY FLOAT VALVE MECHANISM Filed .my 21, 193s au f" I 4 l @6Fl/." A n Patented Nov. 5, 1940 UNlTED STATES vPTENT OFFICE FLOAT VALVE MECHANISM Application July 21, 19'38, Serial No. 220,567

6 Claims.

The present invention relates to a float valve mechanism, particularly adapted for use in controlling the ow of liquid fuel to oil burners, internal combustion engines, or in any connection Where a continuous iiow of liquid is required, in predetermined quantity.

The object of the invention is to provide a float valve mechanism of the character indicated, that will normally function to maintain a predetermined and substantially constant liquid level in the float chamber. In addition, the valve mechanism will automatically function to shut off the flow of liquid from the supply to the float chamber, upon the occurrence of any abnormal condition which interferes with normal operation of the valve and would otherwise cause overflowing of the liquid, to create a fire hazard, as with liquid fuel. The above and other advantageous features of the invention will hereinafter appear from the following description considered in connection with the accompanying drawing, in which:

Fig. 1 is a vertical sectional view of a valve mechanism embodying the invention.

Fig. 2 is an end elevation of the parts of Fig. 1, as Viewed from the right.

Fig. 3 is a plan View of the parts of Fig. 1, with a portion of the top of the float chamber shown.

Fig. 4 is a fragmentary sectional View along the line 4 4 of Fig. 3.

Fig. 5 is a vertical sectional view similar to Fig. 1, but showing the parts of the mechanism in a different position. v

Fig. 6 is a fragmentary View of the valve passage, on an enlarged scale.

Referring first to Fig. 1, the valve mechanism consists of a casing I, having a passage 2, at one end of which is received an inlet pipe 3 connected to a suitable supply of liquid fuel, not shown. A suitable strainer 4 is located within the passage 2, and liquid fuel passing through the strainer 4 from the inlet pipe 3 is admitted to an open float chamber 5 through a port S extending through the bottom of the chamber 5. The inlet port B to the float chamber 5 is surrounded by a flange l, internally threaded toreceive a valve sleeve 8. The sleeve 8 provides a central, longitudinally extending passage 9, in communication with the port 6, and radial openings' IU extending from the passage 9 permit the flow of liquid fuel into the float chamber 5.

For the purpose of controlling the flow of fuel through the valve sleeve passage 9 and openings I0, a Valve member II is longitudinally movable within the sleeve 8. The valve member II provides spaced conical portions I 2 and I3, facing oppositely with respect to' seats I4 and I5, provided by a contracted portion 9a of the sleeve passage 9. In the position of the mechanism 5 shown in Fig. 6, both valve portions I2 and I3 are out of engagement with their respective seats I4 and I5, although it is obvious that upward or downward movement of the valve II will cause closure of the valve passage 9. 10

The valve member II provides a spindle I6, threaded at its upper portion to receive a nut I1, providing a groove I8 engaged b-y the spaced arms I9a, of a lever I9 mounted on a pivot 29. The free end of the lever I9 beyond the spindle 15 nut I l, carries a float 2l, in the form of a cup open at its top. The float 2| provides a siphon tube 22, extending through one wall, with an opening 23 at one end of the tube 22 located just above the bottom of the float 2|. The tube 22 also provides an extension 24 extending down# wardly below the float, and the purpose and function of the siphon tube 22 will be hereinafter described.

The oat lever I9 extends on the opposite side 25 of the pivot from the float 2l, and terminates beneath a cam 25 mounted on a pin 26 turnable with a knob 2l. As best shown in Fig. 2, the knob 2'I provides an indicator 21a, cooperating with markings on a dial 28, and when the indicator 21a, is at the reset position, the cam 25 holds the end of the float lever I9 in the position of Fig. 1, in which both valve portions I2 and I3 are out of engagement with the corresponding valve seats I4 and I5, respectively. 35

Assuming that the iioat chamber 5 is empty to start with, and it is desired to set the apparatus in operation, the knoby 2l is first turned to the reset position, in which the cam 25 moves the float 2l to the position of Fig. 1. Liquid fuel 40 thereupon enters the passage 2 from the inlet 3, and flows upwardly through the port B, the then open valve passage 9 and side openings I0, into the chamber 5. As the fuel rises in the chamber 5, the float becomes buoyant and starts to rise, thereby turning the lever I9 about its pivot 20 and imparting upward movement to the valve II, in the direction of fuel flow in passage 9. When the fuel in the chamber 5 has reached a predetermined level, the lower Valve surface I3 '50 engages the seat I5 to shut off further flow of fuel into the chamber 5.

As the oat 2i starts to rise, the opposite end of the lever I9-rnoves away from the cam 25, whereupon a spring 29, previously placed under 55 A2,..." I.. l

compression by turning the knob 21 to the reset position, is then free to turn the knob to the on position shown in Fig. 2. One end of the spring 29 is fixed, while its other end is connected to the cam pin 26, so that the spring normally maintains the knob in the on position. With the knob 21 in the on position, it is to be noted that the cam 25 will then permit upward movement of the free end of the iioat lever, as indicated in Fig. 5.

With the fuel having reached the level at which it is shut off by engagement of the valve portion I3 with the seat I5, the fuel then flows out of the chamber through one or more discharge openings 30, each in communication with an outlet pipe 3| leading to a burner, or other fuel consuming device. discharge passages 30 are offset from the axis of the float valve II, and each passage 3D has a metering valve 32 movable therein by means of a-'threaded spindle 33.' Each valve Spindle 33 provides a handle 34 cooperating with a dial 35 which, as shown in Fig. 3, provides markings 36 to indicate the rate of discharge of the fuel from the chamber 5 under the control of the valve 32.

As the fuel level in the float chamber 5 falls,

due to consumption of the fuel, the lowering of the float 2| moves the valve spindle I6 downwardly to disengage the valve portion I3 from the seat I5, and thereby again admit fuel to the chamber 5. Therefore, during the normal operation of the valve mechanism, the float 2I continues to rise and fall, and so tends to maintain a constant level of fuel in the chamber 5. In order to vary the normal level of the fuel in the reservoir 5, the operating position of the float 2l can be adjusted by means of the threaded nut I1 on the valve stem I6. Furthermore, a counter- Weight 31 is adjustably mounted on the lever I9 on the opposite side of the pivot 2U, with respect to the float 2I, so that the oat 2I can be partially balanced to obtain a condition of substantial equilibrium of the parts, in their normal operation.

. As set forth above, the normal operation of the valve mechanism tends to maintain a constant level of fuel in the oat chamber 5, due to the cooperation between the lower valve portion I3 and its seat I5. However, upon the occurrence of any abnormal condition, such as would prevent the valve passage 9 from being closed as the float rises, due to the presence of foreign matter, or upon failure of the float 2| to rise, as the fuel accumulates in the chamber 5, provision is made for automatically shutting off the further flow of fuel to the chamber 5.

Assuming that the lower valve surface I3 has failed to closely engage the seat I5 as the fuel rises in the chamber 5, continued rising of the fuel level will result in the fuel overflowing the lip of the open fioat 2I. Therefore, the float will become filled with fuel, and immediately fall towards the bottom of the chamber 5 into the position of Fig. 5. In this position of the float 2I, the upper valve surface Il2 will press tightly againstv the upper seat I4, and thereby shut olf any further flow of fuel into the chamber 5. In this way, flooding of the chamber 5 and overflow of the fuel to create a fire hazard, is automatically prevented, and obviously, a leak in the float 2I so as to render it no longer buoyant, will have the same effect as failure of the Valve mechanism to function. Furthermore, should there be a break in the outlet pipe 3l, the rapid draining of the chamber 5 will permit the float 2I to sink As best shown in Fig. 3, the

by its own weight and close off further flow of fuel to the chamber 5.

After the float 2I has moved downwardly to the position of Fig. 5, in which no further fuel is admitted to the chamber 5, continued outward flow of fuel through the pipe 3I to the consuming device will finally result in the chamber being emp-tied of fuel. As this occurs, the float 2| will be drained of fuel, or any other liquid, automatically by the action of the siphon tube 22. As previously pointed out, the end of the tube 22 inside the oat 2 I, has an opening 23 at substantially the bottom of the iioat, Whereas the tube extension 24 provides an opening well below the oat bottom. Therefore, when the falling fuel level in the chamber exposes the lower end of the tube extension 24, downward flow of the fuel in the tube will result in a siphon effect, and the automatic draining of the float 2I in readiness for resuming normal operation of the valve mechanism.

In order to set the mechanism in operation again, with the parts occupying the position of Fig. 5, it is only necessary to turn the knob 21 to the reset position, previously referred to, thereby causing the cam 25 to turn the lever I9 about its pivot 20, into the position of Fig. l. This raises the Valve spindle I6. and moves the valve portion I2 out of engagement with the seat I4, to again admit fuel to the chamber 5. Assuming that the lower valve portion I3 and seat I5 are free of foreign matter when the knob 21 is turned, fuel will again enter the chamber 5, and the float 2| having been automatically drained by the siphon tube, will resume its function of controlling the admission of fuel to the chamber to maintain a substantially constant fuel level. Up'on raising of the float to disengage the free end of the lever I9 from the cam 25, the spring 29 will return the knob 21 to the on position, Where it will remain during normal functioning of the valve mechanism.

Should it be desired to manually shut off the flow of fuel into the chamber 5, the knob can be turned to the 01T position indicated in Fig. 2. When this occurs, a portion of the cam 25 still farther removed from the axis of the pin 26, will engage the end of the lever I9, and so tilt the float 2I to the position which it normally occupies when raised by the fuel in the chamber 5 to move the valve portion I3 against the seat I5. This shuts off any further flow of fuel to the chamber 5, and the parts will remain in this position until the knob 21 is turned to the reset position, in order to resume normal functioning of the mechanism.

From the foregoing, it is apparent that by the present invention there is provided an improved float valve mechanism that will normally function to maintain a substantially constant fuel level in the float chamber, and is adapted, upon the occurrence of any abnormal condition, to automatically shut off the flow of fuel from the supply to the float chamber. In the operation of the valve II, it is to be noted that the valve portion I3 always closes in the direction of fuel flow through the passage 9. Therefore, in the normal functioning of the valve mechanism to maintain a constant fue] level in the chamber 5, the upward pressure of the fuel stream assists the natural buoyancy of the oat 2l to insure that the flow of fuel will be cut off quickly, when the normal fuel level is obtained.

On the other hand, the downward movement of the valve portion I2, in response to falling of the float 2|, upon the occurrence of an overflow,

or break in the outlet pipe 3|, is always against the direction of fuel ilow in the valve passage 9. Therefore, the upper valve portion l2, which is depended upon to stop the fuel flow upon the occurrence of an emergency, is continuously subjected to the normal flow of fuel, so that dirt cannot readily lodge thereon. As a result, the valve portion l2 is always clean, and in condition to eect a positive closure of the fuel flow, upon being moved downwardly to engage its seat I4 by a falling float 2l.

While for purposes o-f illustration, the mechanism is described in connection with the control of the flow of liquid fuel, obviously it will as readily control the flow of any other fluid medium. Furthermore, the Siphon-operated means for automatically draining the open float, when it lls and sinks, will function just as effectively with the float connected to valve members of different construction from those shownin the drawing.

I claim:

l. In a float valve mechanism, a chamber providing an inlet passage, a valve movable axially of said passage, an open float pivotally mounted within said chamber and a connection between said float and said valve, whereby said float is operable to maintain a substantially lconstant liquid level in said chamber, said oat in its normal operation being adapted to move said valve in said passage to open and close the same, with said iioat being adapted to overflow and sink to move said valve to its closed position, upon an increase of the liquid level in said chamber above normal, and means incorporated in said float and movable therewith, to automatically drain the same when said chamber becomes empty, fol-` lowing shutting oiT of the admission of liquid thereto.

2. In a float valve mechanism, a chamber providing an inlet passage, spaced valve seats provided in said passage, a valve movable axially of said passage and providing portions adapted to engage said seats in response to movement of said valve in opposite directions, an open oat pivotally mounted within said chamber and a connection between said float and said valve, whereby said float is operable to maintain a substantially constant liquid level in said chamber, said float in its normal operation being adapted to move said valve in one direction through said passage to close the same, with said float being adapted to overflow and sink, upon an increase of the liquid level in said chamber above normal, to move said valve, in the opposite direction through said passage to close the same, and a siphon tube carried by said float, with an open end extending outside of and below the bottom of said float for automatically draining the float when the liquid in said chamber flows out to expose the open end of said siphon tube, following shutting olf of said inlet passage by the sunken float.

3. In a oat valve mechanism, the combination with a casing having an inlet passage in one wall thereof, spaced seats provided by said passage, a valve movable axially of the passage for engaging one or the other of said seatsqin accordance with the direction of movement of said valve, a float carried by an arm pivotally mounted in said casing, a connection between said float arm and said Valve, with the weight of said float being sufficient to maintain said valve in engagement with one seat to close the passage when said casing is empty, and a shaft extending through a wall of the casing and turnable from outside, said shaft carrying a cam adapted to engage the float arm on the side of its pivot opposite to said valve connection to turn the arm and raise said valve to disengage both seats and permit the admission of liquid to said casing.

4. In a float valve mechanism, the combination with a casing having an inlet passage in one wall thereof, spaced seats provided by said passage, a, valve movable axially of the passage for engaging one or the other of said seats in acoordance with the direction of movement of said valve, a float carried by an arm pivotally mounted in said casing, a connection between said float arm and said valve, with the weight of said float being suflicient to maintain said valve in engagement with one seat to close the passage when said casing is empty, and a shaft turnable from outside the casing carrying a cam adapted to engage the float arm on the side of its pivot opposite to said valve connection to turn the arm and raise said valve into a position in which the other seat closes the valve passage.

5. In a liquid supply system, a chamber providing a passage for the admission of liquid, a

valve in said passage, a hollow open float movable vfilled float for closing said passage, and means incorporated in said float and movable therewith to automatically drain the same when said chamber becomes empty following the shutting off of the admission of liquid thereto by said secondnamed valve means.

6. In a liquid supply system, a chamber providing a passage for the admission of liquid, a valve in said passage, a hollow open float pivotally mounted in said chamber, connected to Said valve and operating normally in response to changes in the liquid level within said chamber to open or close said Valve for maintaining a substantially constant predetermined liquid level in said chamber, said valve in its closed position limiting further upward movement of said float whereby any failure of said valve when in its closed position to shut off the admission of liquid to said chamber causes filling and sinking of said float by the liquid, valve means responsive to sinking of said filled float for closing said passage, and a siphon tube carried by said float with an open end extending outside of and below the bottom of said float for automatically draining the float when the liquid in said chamber flows out to expose the open end of said siphon tube following shutting oft' of said inlet passage by the second-named valve means.

PAUL SIBLEY.